Zend certified PHP/Magento developer

Can anyone tell me what this exception code means?

This is in my Exception Log: (repeated many times)

main.CRITICAL: {“exception”:”[object] (Exception(code: 0): at /opt/bitnami/apps/magento/htdocs/vendor/magento/module-contact/Controller/Index/Post.php:120)”}

Also, a recent customer purchase is listed as “pending”, yet it did not get processed by my cc processor (authorize.net), though other transactions do seem to get processed fine. I have no idea if the error below is related.

[2019-10-26 17:14:43] main.CRITICAL: Unable to get transaction details. Try again later. {“exception”:”[object] (MagentoFrameworkExceptionLocalizedException(code: 0): Unable to get transaction details. Try again later. at /opt/bitnami/apps/magento/htdocs/vendor/magento/module-authorizenet/Model/TransactionService.php:135)”}